I would just like to point something out regarding this sentence in the RFC on the "Variable pinning" section:
> This particular syntax was chosen as it is the same as in Ruby, the only > other language we know of that has this functionality. I don't know how helpful this info is, but I'll provide it anyway. Elixir and Erlang also have the functionality and its syntax is the same, using the ^ character. https://hexdocs.pm/elixir/pattern-matching.html#the-pin-operator
